The number of parents supplying alcohol to their underage children has halved, as more teenagers steer clear of alcohol and marijuana.

A 15 year study by University of Queensland mapped alcohol trends from 1998 and revealed one in 10 underage drinkers sourced their alcohol from their parents in 2013, a figure that had halved since 2007, according to the Sydney Morning Herald.

UQ's Centre for Youth Substance Abuse Research report published last month in the BMC Public Health journal revealed that despite the trend, three quarters of 14-year-olds say they had tried alcohol in a 2013 survey.

The number of parents supplying alcohol to their underage children has halved, as more teenagers steer clear of alcohol and marijuana

A 15 year study by University of Queensland mapped alcohol trends from 1998 and revealed one in 10 underage drinkers source their alcohol from their parents in 2013, a figure that had halved since 2007

Psychology PhD candidate Megan Weier, who worked on the study, said it was inconclusive if the drop in supply from parents had been a catalyst for a decrease in consumption of alcohol among underage teenagers.

She said there was a chance the alcohol consumption figures could be inflated because the data was self-reported.